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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2018-07-27 13:47:02 -0700
committerTejun Heo <tj@kernel.org>2018-07-30 07:09:10 -0700
commita5ec5a7bfd1f28d1905499641c9f589be36808c1 (patch)
tree592320d7a604f9ca492a29a293983231bbe19a1b /include
parent04ba9488199e3ee9971769cee585ec6847013ed2 (diff)
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ata: ahci: Support state with min power but Partial low power state
Currently when min_power policy is selected, the partial low power state is not entered and link will try aggressively enter to only slumber state. Add a new policy which still enable DEVSLP but also try to enter partial low power state. This policy is presented as "min_power_with_partial". For information the difference between partial and slumber Partial – PHY logic is powered up, and in a reduced power state. The link PM exit latency to active state maximum is 10 ns. Slumber – PHY logic is powered up, and in a reduced power state. The link PM exit latency to active state maximum is 10 ms. Devslp – PHY logic is powered down. The link PM exit latency from this state to active state maximum is 20 ms, unless otherwise specified by DETO. Suggested-and-reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/libata.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h
index aa8583655a18..80c2bd202367 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -522,7 +522,8 @@ enum ata_lpm_policy {
ATA_LPM_MAX_POWER,
ATA_LPM_MED_POWER,
ATA_LPM_MED_POWER_WITH_DIPM, /* Med power + DIPM as win IRST does */
- ATA_LPM_MIN_POWER,
+ ATA_LPM_MIN_POWER_WITH_PARTIAL, /* Min Power + partial and slumber */
+ ATA_LPM_MIN_POWER, /* Min power + no partial (slumber only) */
};
enum ata_lpm_hints {